MS Exchange 2003 SP1 STD

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Exchange security
Microsoft Exchange
Hi to one and all; I have an exchange server that was found to be relaying tons of mail. i have managed to stop the relaying by selecting the following settings in system manager, default smtp connector,Properties,Acess tab,Relay, and select only the list below. However i now have 90 pop accounts / remote users that can send mail within our domain @*.ie but when they try to send outside they receive a return message into their inbox to say error 5.50.7.1 unable to relay.. I have tryed changing the client settings on these 90 accounts which are a mix of Outlook/ Outlook Express. by selecting my server requires authentication "which was always ticked" but i also clicked on settings,and selected log on using and i put the username and the password for the relevent pop account. Now it worked for some but not for many. for some everything worked fine, for others they would be asked for user/pass/and domain before they could send outside our domain.Others were asked for the same info but it would represent the logon box again and again without sending the mail. I am now very frustrated; any help to find a balance would be great. Mark..

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Hello,

You want to make sure you have checked the box “Allow all computers which have successfully authenticated to relay regardless of the list above” which is also located on the ‘Relay Restrictions’ property page.

Good luck!

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  • Shalom88
    hanks petroleumman, That option is ticked ok. I even tryed to add the 90 odd users by clicking the users tab and adding each one and giving relay permissions to each. but to no avail.
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  • Stevesz
    Are the users who are failing to login able to login via OWA and use the Exchange server in that manner? If they cannot, then they are not using the correct login credentials and must rectify that prior to being able to use a POP client to get and send their email. Have you checked your DNS to ensure you have a correct PTR record for your mail server? This could be a cause for the NDRs users are getting when they send mail to those domain that do a check on the rDNS prior to accepting mail. There are other causes, to be sure, but this is the most likely, and some may have problems sending to domains that use blacklistng of domains that are known to spam. Run your DNS checks at a place like http://www.dnsstuff.com. You can run a test on your rDNS and check your IP address for blacklisting on some 270 RBLs.
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  • Shalom88
    Thanks stevesz, Sorry i did not mention we do not use owa at all. These users connect over a hardware VPN. I know the credentials are ok as each user needs an AD account to use the Exchange. its not uncommon for me to have to unlock an account because a user puts in a wrong username or password. On your advice i will check the ptr record on dnstuff although i am pretty sure dns is sound. This problem really occured when i changed the setting in the default smtp connector from all except the list below to only the list below. Mark.
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  • LotDomin
    I am not familiar with Exchange server settings, but in Lotus Notes, there is a configuration settings that you can set - Allow all authenticated users to relay. Hope that works out for you. Thanks.
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  • Shalom88
    Thanks LotDomin Yes same setting in Exchange, but to no avail..
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  • Duznotcompute
    It sounds as though the client settings in Outlook / OE need to be set to authenticate to the outgoing (SMTP) server. In Outlook 2k3 there is an "Outgoing Server" server tab under advanced properties and on that tab check mark the box that says "My outgoing server (SMTP) requires authentication. Then check the place below it where it says "Use same settings as my incoming mail server" You find those same settings in Outlook express under the account properties and change the setting there to authenticate on SMTP. This is what worked for me. Bob
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